Taking the value from user

jayant4285@gmail.com · 08-16-2009, 08:09 AM

Hi,

As shown in the program how can "rf" will take the value of "filename"
what should be the code ....?

BEGIN{
}

#
# main logic is here
#

{
printf "Enter fime namr: "
getline filename < "-"

rpcmd = "sed 's/rf/uuu/' file > file1 "
system(rpcmd)

}

#
# End action, if any, e.g. clean ups
#
END{
}

onebuck · 08-16-2009, 09:40 AM

Hi,

Welcome to LQ!

I smell homework here?

Please read the LQ rules.

colucix · 08-16-2009, 10:06 AM

Hi and welcome to LinuxQuestions.

As already stated by onebuck, we don't give help for homework questions. The best way to learn is to try again and again until you find the answer by yourself. I can only suggest to read the official GNU awk user's guide, which is a very good text for learning the awk secrets. In chapter 5 you will find the answer to your question. In any case, show us your efforts and maybe we'll give some more specific directions.

pixellany · 08-16-2009, 10:36 AM

Moved: This thread is more suitable in <Programming> and has been moved accordingly to help your thread/question get the exposure it deserves.

Note: We can help with homework, but you need to tell us more about the class, what books you are using, etc. In this case, have you used assignment statements to set the value of a variable?

PTrenholme · 08-16-2009, 12:46 PM

That code looks like it's intended to be part of an AWK program. Is that correct? If so, you need something like rf=filename since that's the variable you read from "-."

Note, however, that your system call string (rpcmd = "sed 's/rf/uuu/' file > file1") is not correctly formatted. You need something like rpcmd = "sed \'s/" rf "/uuu/\' file > file1"

And, if you're using AWK, why bother using sed to do a simple substitution in a file that could be done easily in AWK itself?